问使用client Java再现BioGrakn文本挖掘示例时的OutOfMemoryError

EN

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>TextMining-BioGrakn</groupId>
  <artifactId>TextMining-BioGrakn</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>TextMining-BioGrakn</name>
  <repositories>
    <repository>
        <id>repo.grakn.ai</id>
        <url>https://repo.grakn.ai/repository/maven/</url>
    </repository>
</repositories>
    <dependencies>
        <dependency>
        <groupId>io.grakn.client</groupId>
        <artifactId>api</artifactId>
        <version>1.5.2</version>
    </dependency>
    <dependency>
        <groupId>io.grakn.core</groupId>
        <artifactId>concept</artifactId>
        <version>1.5.3</version>
    </dependency>
    <dependency>
        <groupId>io.graql</groupId>
        <artifactId>lang</artifactId>
        <version>1.0.1</version>
    </dependency>
        <dependency>
            <groupId>edu.stanford.nlp</groupId>
            <artifactId>stanford-corenlp</artifactId>
            <version>3.9.2</version>
        </dependency>
        <dependency>
            <groupId>edu.stanford.nlp</groupId>
            <artifactId>stanford-corenlp</artifactId>
            <version>3.9.2</version>
            <classifier>models</classifier>
        </dependency>
    </dependencies>
</project>  

public class Migrator {

    public static void main(String[] args) {

        GraknClient graknClient = new GraknClient("localhost:48555");

        GraknClient.Session session = graknClient.session("text_mining");

        try {
            loadSchema("schema/text-mining-schema.gql", session);
            PubmedArticle.migrate(session);
            CoreNLP.migrate(session);
        } catch (Exception e) {
            e.printStackTrace();
            session.close();
        }

        session.close();
        graknClient.close();
    }
}